Aspherical contact lenses

Aspheric contact lenses, have varying curvatures across the surface, from the
edge to the center. But spherical contact lenses have an even curvature on the
entire surface of the lens.

For aspheric lens wearers, the image is not as distorted as with the spherical contact lenses and
is perceived as sharper because aspherical lenses have very good visualizing
properties at the periphery.